JP2001244155A - Electric double-layered capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an exterior facing package type electric double-layered capacitor which can realize the down-sizing, reduction in thickness, and large capacity of a capacitor structural body, while reducing equivalent series resistance(ESR), and improve the capacitor characteristics as well as its reliabil ity. SOLUTION: This electric double-layered capacitor is provided with a current- collecting body 1, a polarizing electrode 2, a porous separator 3, a single-layer capacitor cell having a laminate of the current-collecting body 1 and polarizing electrode 2 as a unit cell, and a multilayer capacitor cell having at least two or more unit cells. These capacitor cells are integrally housed together within a gasket 4 for attachment formed around its outer circumference. The single- and multilayer capacitor elements, sandwiched by pressure terminal plates 5a whose surface is in contact with an exterior facing package by means of a paired member, are formed on both surfaces of the gasket 4, and each layer of capacitor elements comprising the capacitor element is compactly pressed mutually within the exterior facing package.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of an electric double layer capacitor, and more particularly, to an equivalent series resistance (E).
The present invention relates to an electric double-layer capacitor capable of reducing SR), stabilizing capacitor characteristics, and achieving a reduction in size, thickness, and capacity of a capacitor structure.

[0002]

2. Description of the Related Art Conventionally, electric double-layer capacitors have been put into practical use, and in recent years, the characteristics of the structure of this type of capacitor have been utilized, and in the direction of further miniaturization and large-capacity, the capacitor has been used. Applications are also being considered for new applications such as, for example, a drive power supply for a cell motor of an automobile in combination with a lead storage battery and an auxiliary power supply in combination with a solar cell.

As shown in FIGS. 9A and 9B, such an electric double layer capacitor includes a polarizable electrode 30, a separator 40, a current collector 20 (conductive sheet), an electrolyte solution, and a gasket material 50. And the like as a capacitor element, supported by a gasket 50 so as to surround a pair of polarizable electrodes with a separator 40 interposed therebetween, and a unit capacitor sandwiched on both upper and lower surfaces by a current collector 20 (conductive sheet). A metal terminal electrode plate with lead terminals is crimped to the current collector surface of the cell.

The polarizable electrode contains an organic or aqueous electrolyte solution and is sealed with an exterior package material.

[0005] Since the withstand voltage of such an electric double layer capacitor is limited by the electrolysis voltage of the electrolyte solution, usually, a plurality of unit capacitor cells and the collector surface are joined to each other in accordance with the required withstand voltage. And used as a multilayer capacitor cell connected in series.

For example, JP-A-55-107224, JP-A-55-107225, and JP-A-5-299295.
JP-A-8-83596 and JP-A-11-1353
82 No. is sealed contact sealed under vacuum pack capacitor element obtained by interposing a separator with an electrolytic solution between free immersion carbonaceous electrode of an organic polymer laminate sheathing material to the core metal films, the equivalent series resistance is low An electric double layer capacitor excellent in impact resistance and the like is described.

Japanese Patent Application Laid-Open No. Hei 5-299295 discloses that a single capacitor is pressurized on the upper and lower portions of a capacitor element in an exterior film pack in order to reduce the contact resistance of a crimping joint surface constituting a unit capacitor cell. It is described that a holding plate is provided, pressurized and screwed.

[0008]

Under the above circumstances, as described above, an electric double layer capacitor is usually tightly sealed with an external package such as a vacuum pack. , The inside is decompressed and sealed, and the laminated capacitor elements, especially between the current collectors,
Improve the adhesion between the terminal-current collector and the electrode-current collector,
The equivalent series resistance is reduced, and the capacitor characteristics are further stabilized and improved.

In recent years, such electric double-layer capacitors have tended to have higher capacities, smaller sizes, and thinner thicknesses. Many proposals have been made to lower the contact resistance of the pressure-bonded joint surface constituting the layer and the multilayer capacitor cell to further stabilize it.

For example, a capacitor cell having a laminated structure is
Even in the proposal of providing pressure plates from both sides of the terminal electrode to improve the pressure contact of the laminated body, it is difficult to make the pressure contact of the capacitor cell uniform, There was a tendency to cause displacement.

As a result, problems such as cracks and collapses of the electrode layer, non-uniformity of pressure adhesion, cracks in the package and occurrence of damage cannot be sufficiently solved, and the reliability of the product can be improved.
In fact, the equivalent series resistance (ESR) characteristics and their stabilization are not yet sufficiently satisfied.

Therefore, an object of the present invention is to increase the capacity, reduce the size, and reduce the thickness of such an electric double layer capacitor, and the capacitor structure enables the reduction in size and thickness. The structure, especially the convenience of a vacuum pack etc., under the external packaging, the equivalent series resistance (ES
It is an object of the present invention to provide an electric double-layer capacitor capable of reducing R), preventing a displacement of a laminate forming a capacitor cell in a packaging step or the like, and stabilizing capacitor characteristics.

[0013]

Means for Solving the Problems In view of the above-mentioned problems, the present inventor has made intensive studies to solve the problems. As a result, elements for forming a capacitor cell, particularly, a gasket material and a pressure terminal plate By focusing on etc., for example,
The inventors have found a capacitor structure capable of applying uniform pressure contact to each layer of the cell structure under a vacuum pack and effectively preventing the displacement thereof, thereby completing the present invention.

That is, according to the present invention, a single-layer capacitor cell having a laminated body as a unit cell, in which a press-bonded body of a current collector and a polarizable electrode with an electrolyte solution interposed therebetween is opposed to a porous separator. Alternatively, a multilayer capacitor cell in which a plurality of the unit cells are stacked is sealed by an outer package, and each capacitor element is pressed and adhered evenly, thereby preventing displacement of the stacked body and its constituent capacitor elements. It is possible to provide an electric double layer capacitor with reduced equivalent series resistance (ESR), stabilized capacitor characteristics, and improved reliability.

For this purpose, in the present invention, the single-layer or multi-layer capacitor cell is housed in a mounting gasket provided on the outer periphery thereof.

A terminal electrode plate with a lead terminal is disposed on each of both surfaces of the current collector of the integrated capacitor cell, and the surface of the terminal electrode plate that contacts the inside of the outer package is
A pressure terminal plate having a uniform inclined surface on its outer periphery,
It is characterized by being sandwiched by the pressing terminal plate to form a capacitor element.

By forming the cells in a sandwich shape with such a pressure terminal plate, for example, under a vacuum pack, the effect of having the inclined surface is obtained through the pressure terminal plate as an effect of having the inclined surface of the element. The pressing stress is evenly distributed and pressed on the electric body surface), and as a result, the respective capacitor elements constituting the capacitor element sealed in the outer package are uniformly pressed and adhered to each other.

Further, in addition to the effect of the pressure terminal plate, in the present invention, the pressure-contact terminal plate is pressure-contacted to both surfaces of a current collector of a single-layer or multi-layer capacitor cell housed in a mounting gasket. The pressurized terminal plate has a mounting gasket,
It is characterized in that the male and female are in close contact with each other in a mating (fitting) relationship.

Furthermore, in addition to the effect of the pressure terminal plate, in the present invention, the pressure-contact terminal plate is pressure-contacted to both surfaces of a current collector of a single-layer or multi-layer capacitor cell contained in a mounting gasket. The pressure terminal plate is provided with a positioning gasket in which the periphery of the pressure terminal plate is closely adhered to each other on the upper and lower frame surfaces of the mounting gasket in a male-female relationship to facilitate positioning. , Are supported.

As described above, when the gasket for positioning the pressurizing terminal plate and the mounting gasket or the pressurizing terminal plate is provided, it is provided in a male-female female (fitting) relationship.
The adhesion is improved, and the displacement of each element constituting the capacitor cell can be effectively prevented, so that the operation of the pressing terminal plate is further stabilized.

Still further, in the present invention, a rectangular pressure terminal plate having a flat upper surface without using a pressure plate having a uniform inclined surface as described above is used. In particular, if the size of the contact surface of the pressure terminal plate is smaller than the size of the current collector surface between the upper and lower current collector surfaces of the element cell to be formed, the stepped portion provides uniform addition. Since the pressure is maintained, a similar effect as described above can be obtained.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electric double layer capacitor according to the present invention will be described below with reference to FIGS.

First, the structure of the electric double layer capacitor according to the present invention, which has already been described above, can be exemplified by the embodiments as shown in FIGS.

Therefore, as shown in FIGS. 1 (a) and 2 (b), usually, an electric double-layer capacitor includes a current collector 1, a polarizable electrode 2, a porous separator 3- An integrated body composed of a stacked body of the polarizing electrode 2 and the current collector 1 is housed as a single-layer capacitor cell of a unit cell. For example, two unit cells are stacked with the current collector 1 as a connection surface. Is generally used as a multilayer capacitor cell.

In the present invention, if necessary,
As shown in FIG. 2 (c), the mounting gasket for accommodating the multilayer capacitor cell is a single-layer capacitor cell of two unit cells having the current collector 1 as a connection surface, and is housed in an integrated mounting gasket. Can be used as appropriate.

In FIG. 1, the cross-sectional shape of the uniform inclined surface of the current collector 1 on both the upper and lower surfaces of the integrated multilayer capacitor cell has a linear inclined surface 11a (FIG. 6A). C side)
A pressure terminal plate 5b (see FIG. 1) having a convex inclined surface 11b (R surface) having a cross-sectional shape shown in FIG. 6B is provided in FIG. (See Fig. 2)
And sandwiched under pressure to form multilayer capacitor elements, respectively.

In the present invention, when such a capacitor element is pressure-bonded and sealed with an outer package, for example, if the capacitor element is sealed under a vacuum pack, the surface of the pressure terminal plate abutting inside the outer package 8 is By providing the uniform inclined surface as described above, the capacitor cell (or the capacitor element) is characterized in that the capacitor cell (or the capacitor element) is pressure-contacted uniformly from both upper and lower surfaces, as described above. Also, if necessary, the shape of the inclined surface is changed as shown in FIG.
As shown in (c), a pressure terminal plate having a concave inclined surface 11c may be used.

Thus, for example, as shown in FIG.
By using a pressure terminal plate having a uniform slope on the outer peripheral edge of the pressure terminal plate, as described above, due to its structural characteristics, for example, under a vacuum pack, on both upper and lower surfaces of the capacitor cell Uniformly distributed pressing stress acts on the capacitor cell layer, and uniform contact between both surfaces of the current collector of the capacitor cell and the terminal electrode plate (or the pressing terminal plate as a terminal electrode) is obtained. Can be as a result,
In particular, the ESR characteristics can be stabilized.

Further, in the present invention, as shown in FIGS. 6 (a), 6 (b) and 6 (c), the pressing terminal plate preferably has a trapezoidal sectional shape. In handling the capacitor package, the trapezoidal surface can be stably set as an installation surface via the flat trapezoidal surface.

Therefore, in FIG. 1 or FIG. 2, the terminal electrode plate is not shown except for the lead terminals 7a and 7b of the terminal electrode plate. However, in the present invention, usually, as shown in FIG. The pressure terminal plate itself is an electrically conductive lead terminal 7a,
It is preferable to use a terminal electrode plate provided with a lead terminal portion having a thickness equal to that of the pressure terminal plate as shown in FIGS. 5 (a) and 7 (c). .

However, in the present invention,
The thickness of the integrated pressure terminal plate and the thickness of the terminal plate and the lead terminal are not limited to those having the same thickness.

That is, as shown in FIG. 5B, the pressure terminal plate portion is thicker than the lead terminals,
As shown in (c), between the upper and lower pressing terminal plates and the current collector,
A terminal electrode plate separated from the pressure terminal plate may be provided,
The combination of the pressure terminal plate 5f and the terminal electrode plates 6a, 6b with the lead terminals 7a, 7b is also suitably and suitably used. Thus, many non-electrically conductive members such as plastic can be appropriately used for the pressing terminal plate 5f.

As shown in FIG. 7 (b), in such a separation type pressure terminal plate, the non-electrically conductive (insulating) pressure terminal plates 6a and 6b are moved in the direction of the AA 'plane. The upper and lower pressing terminal plates 6a and 6b connected by an insulating member so as to form a U-shape can be appropriately used as an integrated structure. As a result, the capacitor element can be stably and easily mounted inside the U-shape.

In the present invention, the lead terminal portion of either the separated type or the integrated type is, for example, a lead terminal 7a attached to a separated type terminal electrode plate shown in FIG. , 7b, preferably, the lead terminal portion is pulled out to a predetermined same edge side beyond the gasket for mounting the capacitor element, and one end is chamfered at this edge to form an edge surface of the gasket. It is preferable that the end portion is bent along the same plane and is drawn out in the same plane AA ′ direction. By pulling out the lead terminal portion in this way, the opening of the exterior package can be easily and stably made.

When the lead terminal portion is bent along the edge surface of the gasket, it is preferable that the lead terminal portion is bent and pulled out so as to provide a minute gap between the lead terminal portion and the current collector. This is preferable because a short circuit with the lead lead terminal or a short circuit with the terminal electrode plate on the opposite side to the lead lead terminal is prevented.

Regarding the above-described chamfering at the edge, in the present invention, regardless of the integral type shown in FIG. 7D and the separated type shown in FIG.
a, 7b preferably have at least 90% of the inner corners A of the lead terminals (see FIGS. 7 (d) and 7 (e)) which are chamfered and bent at the edges of the mounting gasket.
Having an angle of 角度 or more is particularly preferable in relation to the ESR characteristics.

Further, the chamfered portion at the time of this bending is 90
゜ By doing so, the current collector, particularly the current collector exposed on the periphery of the gasket for mounting the capacitor cell, is short-circuited due to the drawn lead terminal portion hitting the current collector and the short-circuit, etc. This can prevent a decrease in reliability.

In addition to the effect of using the pressure terminal plate as described above, a feature of the present invention is that the male-female female eye (fitting) -related embodiment described above will be described with reference to FIGS. This will be described below.

That is, as shown in FIG. 3 (a), the single-layer or multi-layer capacitor cells (or capacitor elements) housed in the mounting gasket 4a are pressure-contacted to both upper and lower current collectors. In the pressure terminal plate 5c, when the pressure terminal plate 5c and the mounting gasket 4a are brought into pressure contact with each other,
Preferably, the periphery of the pressure terminal plate 5c is a male,
The engraved portion provided on the inner peripheral edge of the gasket surface of the mounting gasket 4a becomes a female frame of the support frame, so that a male-female female eye relation (see the K1 part in FIG. 3 (a)) is appropriately suitable. This is what you are wearing.

This makes it possible to effectively prevent displacement of each layer of the capacitor element during the exterior packaging process. As a result, it is possible to stabilize the pressure adhesion by the pressure terminal plate described above, improve the ESR characteristics, and prevent the electrode terminal from being deviated due to the displacement of the pressure terminal plate, thereby preventing the electrode from being deteriorated due to breakage or collapse. Further, a short circuit in the capacitor cell can be prevented, and the capacitor characteristics are stabilized.

The outer peripheral edge of the support frame type gasket 4a which comes into contact with the package is not shown in FIG. 3, but is preferably cut off as shown in the gasket 4c shown in FIG. It is preferable that the R surface 12 is formed. This can prevent damage such as cracking of the pack particularly when the outer package is a film pack.

Further, in the present invention, as shown in FIG.
The convex protrusions provided at at least two places on the upper and lower frame surfaces of the mounting gasket 4b and the at least two concave holes provided on the pressing terminal plate are in a male-female female-eye relationship [FIG.
(See part K2 of FIG. 3 (b)], and the same effect can be obtained by bringing them into close contact with each other in the same manner as in FIG. 3 (a) described above.

In the present invention, as shown in FIG.
The positioning gasket 9 for positioning the pressure terminal plate is provided on the inner peripheral gasket surface of the mounting type gasket 4c, and mounted inside the mounting gasket so that the pressure terminal plate is fitted. The displacement of the pressure terminal plate can be effectively prevented.

Here, the thickness of the positioning gasket is equal to or less than the thickness of the terminal plate.
This facilitates uniform pressing by the pressing terminal plate, and contributes to securing reliability and stabilizing ESR characteristics.

Further, in the present invention, it is preferable that the area of the pressure terminal plate to be pressure-bonded to the capacitor cell is at least equal to or larger than the cross-sectional area of the polarizable electrode. Prevention of liquid leakage due to breakage of the current collector in close contact with the terminal plate, breakage and breakage of the polarizable electrode layer, and the like can be effectively achieved, thereby preventing deterioration of characteristics and stabilizing characteristics.

As described above, when the electric double-layer capacitor structure according to the present invention, which provides the characteristics, is packaged as an external package, as shown in FIGS. Through the inclined surfaces of the R surface and the C surface, the package can be sealed under pressure and adhesion as appropriate regardless of whether the package is a resin package or a vacuum package of an exterior film.

In particular, as the exterior film under the vacuum packing of the exterior film, preferably, a laminated composite film with a resin film having an aluminum foil as a core material is suitably used suitably.

Examples of the resin film to be laminated include polyolefin-based films such as polyethylene and polypropylene, polyamide-based films, polyester-based films such as polyethylene terephthalate, and the like. It may be a laminated film combining films.

In the present invention, as shown in FIG.
An outer frame member 10 made of a soft resin or an elastic rubber is provided on the outer periphery of the capacitor element, and the capacitor element can be double supported by this member.

The outer frame member is preferably made of a soft, rubbery elastic material, and the outer frame member 1 shown in FIG.
When the outer peripheral edge portion is a rounded R surface as in 0, it is possible to prevent displacement of the cell laminate and to prevent damage to the film pack during vacuum packing. Further, it is suitably used suitably as a shock-absorbing material against impact from the outside.

Examples of the material of the outer frame member include rubber elastomers such as polystyrene thermoplastic elastomer, polyolefin thermoplastic elastomer, polydiene thermoplastic elastomer, chlorine thermoplastic elastomer, and engineering plastic thermoplastic elastomer. (Synthetic rubber).

The current collector, electrolyte solution, polarizable electrode, separator, and gasket material used in the present invention are not particularly limited.

As the current collector, for example, a rectangular rubber or plastic sheet obtained by kneading conductive carbon powder into butyl rubber or plastic, or a metal foil is used. A dilute sulfuric acid aqueous solution is used as an electrolyte solution.If necessary, a non-aqueous polar solvent such as propylene carbonate, diethyl carbonate, ethyl carbonate, and ethyl methyl carbonate may be used as a non-aqueous electrolytic solution, such as tetraethylammonium tetrafluoroborate. And the like can be used. As the polarizable electrode, a sheet formed by powdered activated carbon with a binder such as a phenol resin and a sheet-shaped or block-shaped activated carbon obtained by firing a block are used. Examples of the separator include woven or nonwoven fabric of non-conductive glass fiber, polypropylene, polytetrafluoroethylene (PTFE), and polyvinylidene fluoride (P).
For example, a porous resin film such as VDF) is used. As the gasket material, a heat-resistant ABS resin, an insulating butyl rubber sheet, or the like is used.

[0054]

EXAMPLES The present invention will be described below with reference to examples.
The invention is in no way limited to these.

Therefore, an electric double layer capacitor according to the present invention was manufactured and compared with a comparative example (modification) based on a conventional electric double layer capacitor, and an equivalent series resistance (ESR) as an initial characteristic of these capacitor cells was obtained. ), Self-discharge characteristics (SD), reliability (relative average life) and the like were examined by the following methods.

<Self-discharge characteristics (SD)>
After applying the voltage for 4 hours, the terminals of the sample are opened, and the voltage between the terminals for zero time (immediately after opening) is reduced by 24 hours.
The voltage residual ratio (%) after time was calculated and evaluated.

<Equivalent Series Resistance (ESR)> ESR as an initial characteristic was evaluated by measuring the impedance at a test signal frequency of 1 kHz by an AC four-terminal method and calculating its real part.

<Relative Average Life> The reliability test was carried out at a high temperature of 70 ° C. with 8 V applied for 1000 hours.
The relative average life was determined. The relative average life was determined by calculating the time to failure for each sample by each of the above-described tests, plotting the time on a Weibull probability sheet, and obtaining the average life (MTTF) for each level obtained from the results. Life expectancy of 1
Was evaluated.

The number of samples was set to 50 for each level, and the average was determined. The sample used was one in which ten basic cells were stacked in series and integrated.

(Example 1) In this example, the size of the bonding surface (pressure contact surface) between the pressure terminal plate (thickness = 0.3 mm) of the flat plate with the lead terminal and the element was the same, and The lead terminal portions are the lead terminals 7a and 7 shown in FIG.
An electric double layer capacitor in which the chamfer angle A of b was 90 ° and the first variation A was 60 °, 75 °, 105 °, and 135 ° was produced and evaluated.

As a second modification, A is 75 °, 9
With respect to 0 °, 105 °, and 135 °, an electric double layer capacitor is prepared in which the size of the pressure terminal plate is smaller than the size of the element in the size of the bonding surface (pressure contact surface) between the pressure terminal plate and the element. Was evaluated.

(Embodiment 2) In this embodiment, the size of the joint surface (pressure contact surface) between the pressure terminal plate with lead terminals and the element is the same, and the pressure terminal plate has a uniform inclined surface. And an electric double-layer capacitor whose inclined surface is the R surface 11b as shown in FIG. 6B was prepared and evaluated. R = 0.05 and 0.1 mm (that is, the radius of the R surface).

As a first modification, the inclined surface is
An electric double layer capacitor having the C-plane 11a as shown in FIG. 6A was manufactured and evaluated. Its C = 0.05, 0.
1 mm (that is, the size of the distance from the vertex of the corner portion to the end of the chamfered portion when no chamfering is performed).

(Embodiment 3) In this embodiment, with respect to the outer frame 10 shown in FIG. 8, the thickness L of the outer frame and the thickness B of the gondenser element (the thickness of the unit cell × the number of stacked cells). , L> B, L = B, and L <B were prepared and evaluated.

As a first modification, when L = B, the outer edge of the outer frame has an R surface 13 (R = B) as shown in FIG.
0.1) was manufactured and evaluated.

(Embodiment 4) In this embodiment, as shown in FIG. 4, gaskets 9 for positioning the pressing terminal plate are provided above and below the capacitor element, and the thickness of the gasketer <the thickness of the pressing terminal plate. An electric double layer capacitor was manufactured and evaluated.

Table 1 summarizes the above evaluation results.
Equivalent series resistance (ESR) and self-discharge characteristics (S
D) and reliability (relative average life),
In the electric double-layer capacitor according to the present invention, as a structural characteristic, an inclined surface (R surface, C surface) is provided on the pressure terminal plate, or the size of the terminal plate is made smaller than the size of the current collector. The bend angle of the bent portion of the lead terminal is at least 90 °, the element bonding surface of the pressure terminal plate is larger than the polarizable electrode surface of the element, and furthermore, the capacitor element structure in contact with the exterior package is formed. It is well understood that by making the corners of the gasket, the outer frame and the like to be formed into the R-plane, good effects can be obtained in ESR, SD and relative average life. It is also understood that when the size of the terminal plate is smaller than the size of the element, the same operation and effect can be obtained without providing an inclined surface on the pressing terminal plate.

[0068]

[Table 1]

[0069]

As described above, according to the present invention, a unit capacitor cell in which a current collector and a polarizable electrode are pressure-bonded to each other with a porous separator sealed in an exterior package interposed therebetween,
And an electric double layer multilayer capacitor obtained by laminating a plurality of them, by providing a pressing terminal plate having a uniform inclined surface as an element structure thereof, or by providing an inclined surface on the pressing terminal plate. Since the size of the terminal plate is smaller than the size of the element without providing the same, each capacitor element of the element configuration is pressure-contacted under even pressure under the outer packaging such as a vacuum pack, and an equivalent series resistance (ESR). ) Is reduced, and the capacitor characteristics are stabilized.

In addition, by providing a gasket member for preventing displacement of the element laminate and its constituent capacitor elements in connection with the pressure terminal plate, in particular, the collapsible electrode layer is prevented from collapsing and cracking. Stabilize the characteristics,
Shorts between cells can be prevented, and the reliability of the capacitor is improved.

In connection with this pressurizing terminal plate, a pressurizing terminal plate press-contacted to both surfaces of the current collector of a single-layer or multi-layer capacitor cell housed in a mounting gasket as one body is The mounting gasket and the male and female are in close contact with each other in a mating relationship.

Further, the pressure terminal plate is supported by a positioning gasket which is closely attached to the male and female female members on the upper and lower frame surfaces of the surrounding mounting gasket.

By providing such a male-female hook-and-eye (fitting) relationship, the adhesion can be improved, and the displacement of each capacitor element constituting the capacitor cell can be effectively prevented. In addition to stabilizing the operation, the formation of the capacitor element is facilitated.

Further, in connection with the pressing terminal plate, by separating the pressing terminal plate and the terminal electrode plate with lead terminals from each other, in particular, many non-electrically conductive suitable materials are used as the pressing terminal plate. The use of the pressurized terminal plate which is vertically connected allows the element to be easily mounted and the workability of the assembly to be improved.

[Brief description of the drawings]

FIG. 1 shows a schematic sectional view and a top view of an electric double layer capacitor structure according to the present invention.

FIG. 2 shows a schematic sectional view and a top view of an electric double layer capacitor structure according to the present invention.

FIG. 3 is an enlarged schematic sectional view of the electric double layer capacitor structure according to the present invention.

FIG. 4 is an enlarged schematic sectional view of an electric double layer capacitor structure according to the present invention.

FIG. 5 is a conceptual diagram illustrating an example of a pressure terminal plate and a terminal electrode plate according to the present invention.

FIG. 6 is a diagram illustrating a cross-sectional shape of a pressure terminal plate having a uniform inclined surface used in the present invention.

FIG. 7 is a perspective view and a front view showing an example of a terminal electrode plate with various lead terminals used in the present invention and examples of the lead terminals and the pressure terminal plate.

FIG. 8 shows a schematic sectional view and a top view of an electric double layer capacitor structure according to the present invention.

FIG. 9 is a schematic sectional view of a conventional electric double layer capacitor structure.

[Explanation of symbols]

 1,20 Current collector 2,30-minute polar electrode 3,40 Separator 4,50 Gasket (gasket for mounting) 5,5a, 5b, 5c, 5d, 5e, 5f Pressing terminal plate 5a Slant surface is C-plane Pressing terminal plate 5b Pressing terminal plate 5e having an inclined surface having an R surface 5e Pressing terminal plate integrated with terminal electrode plate with lead terminals 5f Pressing terminal plate 6a, 6b with separated terminal electrode plate with lead terminals Terminal electrode plate 7a, 7b Lead terminal 8 Exterior package 9 Positioning gasket 10 Outer frame member 11a, 11b, 11c Cross-sectional shape of inclined surface 12, 13 R surface of edge

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Kazuya Mimura Inventor, 5-7-1 Shiba, Minato-ku, Tokyo Inside NEC Corporation (72) Yutaka Nakazawa 5-7-1, Shiba, Minato-ku, Tokyo Within NEC Corporation (72) Inventor Satoshi Abe 560 Irizen-cho, Shimoshinagawa-gun, Toyama Prefecture Inside Toyama NEC Corporation (72) Inventor Tomoji Arai 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation In-house (72) Inventor Naofumi Yasuda 5-7-1 Shiba, Minato-ku, Tokyo Within NEC Corporation (72) Inventor Toshihisa Nagasawa 560 Izen-cho, Irizen-cho, Shimoshinagawa-gun, Toyama In-house Toyama NEC Corporation (72) Inventor Koji Sakata 5-7-1 Shiba, Minato-ku, Tokyo Within NEC Corporation (72) Inventor Mitsuru Ogawa 5-7-1 Shiba, Minato-ku, Tokyo Inside NEC Corporation

Claims (19)

[Claims] 1. A unit cell in which said capacitor elements are stacked in the order of a current collector, a polarizable electrode with an electrolyte solution interposed, a porous separator, a polarizable electrode with an electrolyte solution interposed and a current collector. In a single-layer capacitor cell or a multilayer capacitor cell having a current collector surface of at least two or more unit cells as a stacking surface, an electric double-layer capacitor sealed with an outer package, wherein the capacitor cell is A terminal electrode plate with a lead terminal is placed as an integral body in a mounting gasket provided on the outer periphery, and a terminal electrode plate with a lead terminal is disposed on each of both surfaces of the current collector of the capacitor cell integral body, and the terminal electrode plate is a pressure terminal. A pressurizing terminal plate having a uniform inclined surface, wherein the surface in contact with the outer package is provided as a pressurized terminal plate. The electric element, wherein each of the capacitor elements of the capacitor element formed as a single-layer or multi-layer capacitor element sandwiched by a pressure terminal plate is pressed and adhered to each other in the outer package. Multilayer capacitors. 2. A unit cell in which said capacitor elements are laminated in the order of a current collector, a polarizable electrode with an electrolyte solution interposed, a porous separator, a polarizable electrode with an electrolyte solution interposed and a current collector. In a single-layer capacitor cell or a multilayer capacitor cell having a current collector surface of at least two or more unit cells as a stacking surface, an electric double-layer capacitor sealed with an outer package, wherein the capacitor cell is A terminal electrode plate with a lead terminal is placed as an integral body in a mounting gasket provided on the outer periphery, and a terminal electrode plate with a lead terminal is disposed on each of both surfaces of the current collector of the capacitor cell integral body, and the terminal electrode plate is pressed. A terminal plate, wherein a surface abutting on the outer package is provided as a pressure terminal plate having a uniform inclined surface, and the mounting gasket and the pressure terminal Are tightly adhered to each other in a male-female relationship, and the capacitor cell unit is formed as a single-layer or multi-layer capacitor element sandwiched by the pressing terminal plate, and the respective capacitors of the capacitor element are formed. An electric double-layer capacitor, wherein elements are pressed together in the outer package. 3. In the male-female female eye relation, a support frame gasket is provided as a female frame on the upper and lower frame surfaces of the mounting gasket, and the pressing terminal plate is mounted in a male female eye relation. The electric double layer capacitor according to claim 2, wherein 4. The electric double-layer capacitor according to claim 3, wherein an outer peripheral edge of the support frame gasket in contact with the outer package has an R-shaped surface. 5. In the aforementioned male-female female eye relation, at least two convex projections provided on the upper and lower frame surfaces of the mounting gasket, and at least two projections provided on the pressing terminal plate. 3. The electric double layer capacitor according to claim 2, wherein the concave holes are in close contact with each other in a male-female relationship. 6. A unit cell in which said capacitor elements are stacked in the order of a current collector, a polarizable electrode with an electrolyte solution interposed, a porous separator, a polarizable electrode with an electrolyte solution interposed and a current collector. In a single-layer capacitor cell or a multilayer capacitor cell having a current collector surface of at least two or more unit cells as a stacking surface, an electric double-layer capacitor sealed with an outer package, wherein the capacitor cell is A terminal electrode plate with a lead terminal is placed as an integral body in a mounting gasket provided on the outer periphery, and a terminal electrode plate with a lead terminal is disposed on each of both surfaces of the current collector of the capacitor cell integral body, and the terminal electrode plate is pressed. A terminal plate, the surface of which is in contact with the outer package is provided as a pressure terminal plate having a uniform inclined surface; A single-layer or multi-layer capacitor element, supported by an alignment gasket that is closely attached to the upper and lower frame surfaces of the sket in a male-female female-eye relationship, wherein the capacitor cell integrated body is sandwiched by the pressing terminal plate. The electric double-layer capacitor, wherein each of the capacitor elements of the capacitor element is pressed and adhered to each other in the outer package. 7. The electric double layer capacitor according to claim 6, wherein the thickness of the positioning gasket is equal to or less than the thickness of the terminal plate. 8. A cross-sectional shape of a uniform inclined surface of said contact surface,
The electric double layer capacitor according to any one of claims 1 to 7, wherein the electric double layer capacitor is any one of a straight line, a convex shape, and a concave curve. 9. A unit cell in which said capacitor elements are laminated in the order of a current collector, a polarizable electrode with an electrolyte solution interposed, a porous separator, a polarizable electrode with an electrolyte solution interposed and a current collector. In a single-layer capacitor cell or a multilayer capacitor cell having a current collector surface of at least two or more unit cells as a stacking surface, an electric double-layer capacitor sealed with an outer package, wherein the capacitor cell is A terminal electrode plate with a lead terminal, which is a pressing terminal plate, is tightly attached to each of both sides of the current collector of the capacitor cell integrated member, and is housed in a mounting gasket provided on the outer periphery. The size of the contact surface with the current collector is smaller than or equal to the size of the surface of the current collector, and the integrated capacitor cell is sandwiched by the pressure terminal plate. Is formed as a layer or layers capacitor element, with which the respective capacitor element of the capacitor element, in the outer package, an electric double layer capacitor, characterized in that it is compacted wear each other. 10. A gasket for positioning, wherein the periphery of said pressure terminal plate is brought into close contact with each other on the upper and lower frame surfaces of said mounting gasket in a male-female relationship. 3. The electric double layer capacitor according to claim 1. 11. The pressure terminal plate according to claim 1, wherein said pressure terminal plate and said terminal electrode plate are made of a member separated from each other, and said pressure terminal plate is a non-conductive member. An electric double layer capacitor according to any one of the preceding claims. 12. The pressure terminal plate of the non-conductive member, wherein upper and lower pressure terminal plates which are in close contact with upper and lower surfaces of the capacitor element are connected in a U-shape. An electric double layer capacitor according to claim 11. 13. A pressure terminal plate having a trapezoidal cross section on a surface of the pressure terminal plate having a uniform inclined surface which comes into contact with an exterior package. The electric double-layer capacitor according to any one of claims 12 to 12. 14. The terminal plate according to claim 1, wherein the size of the surface of the terminal plate on the contact side with the polarizable electrode is at least equal to or greater than the size of the contact surface of the polarizable electrode. An electric double layer capacitor according to any one of claims 1 to 13. 15. A lead terminal of the terminal electrode plate with a lead terminal is drawn out to a predetermined same edge side of the capacitor element, one end thereof is chamfered at the edge, bent along the edge surface, and further, a tip portion thereof. The electric double layer capacitor according to any one of claims 1 to 14, wherein is bent at a right angle and is drawn out in the same plane direction. 16. The interior of said chamfer wherein at least 90
16. The semiconductor device according to claim 15, which has at least an R surface.
3. The electric double layer capacitor according to claim 1. 17. The method according to claim 1, wherein the sealing by the outer package is a vacuum packing of an outer film.
The electric double-layer capacitor according to any one of claims 16 to 16. 18. The electric double layer capacitor according to claim 17, wherein the exterior film is a laminated composite film using aluminum foil as a core material. 19. The electric double layer according to claim 1, wherein an outer periphery of said capacitor element is supported by an outer frame member made of soft resin or elastic rubber. Capacitors.